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�=0"- - Na r a s. {aG filling to grade with neat cement. The location of the four wells and two soil borings is shown on Figure 2. The drill cuttings were stored adjacent to the u/g tank and covered with plastic sheeting. Subsequent to completion, the wellheads were surveyed to a common datum and groundwater levels monitored to determine the site specific groundwater gradient. Depth to F-= groundwater was measured in accordance with WaterWork's Groundwater Monitoring Protocol (Appendix III). The wellhead survey and groundwater monitoring data is presented in Table 3.2 Soil Sampling Grab iamples of cuttings wrre logged continuously during drilling for identification of stratigraphy and detection of hydrocarbon contamination. Field screening of volatile �., �?rganics emitted from the soils was conducted with a pftotoionization detector (PID) . The PID readings are plotted adjacent to the soils tested on the well log (Appendix 1). Discrete samples 'were: . taken at .five""foot intervals .to the ,water : table::starting at :five:: feet.' below grade. These samples were collected in two' inoh� 'diameter brass tubes using a California modified sampler. Samples - were cvlleoted, preserved and transported under chain-of- custody in accordance with WaterWork's Soil, ;Sampling Protocol (Appendix II). _ `from each boring -.wras: analyse arenzainiz'toluene, ethylbenzene 'and ,xylenes (BTEX) .b EPA'.:8020 ' and total- Mehews petroleum hydros se TPH-Dj -by 'Cal �Q� - alth Services test methodology: The minimum tection level for SEX in soil samples analyzed by E.C.C�!, aboratories is 0.02 ppm; for TP in soil samples, 10.0 ppm. 3.3 Groundwa er br. Subsequent to installation and well development, water c'� samples were collected from the monitoring wells after `{ purging a minimum of four well volumes pack) from each well. The purging lo (arepresented in � sing and sand ref Appendix IV. The p g g gs n parameters electrical conductivity (£C), W pH and temperature was checked during purging, and before �j and after sample collection to ensure samples collected are-/- E �- representative of formation water. d water was ischar ed directly into the facilities sewer line which Ppb is pied to t e waste water treatment plant. Water sample `}tp collection, preservation and transportation under chain of custody was conducted in accordance with WaterWork's � Groundwater Sampling Protocol (Appendix. III). The water re lyzed for BTEX, and TPH- as diesel by EPA 5030/8015/ 20 he minimum detection level for BTEX in - s analyzed 'by Sequoia Analytical is 0.3 ppb; for TPH in wate samples, 30.0 ppb. Because the monitoring wells were 1 sated within 50 feet of sanitary sewer lines 3